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• W2397748254 abstract "We study the complexity of black-box constructions of pseudorandom functions (PRF) from one-way functions (OWF) that are secure against non-uniform adversaries. We show that if OWF do not exist, then given as an oracle any (inefficient) hard-toinvert function, one can compute a PRF in polynomial time with only k(n) oracle queries, for any k(n) = ω(1) (e.g. k(n) = log∗ n). Combining this with the fact that OWF imply PRF, we show that unconditionally there exists a (pathological) construction of PRF from OWF making at most k(n) queries. This result shows a limitation of a certain class of techniques for proving efficiency lower bounds on the construction of PRF from OWF. Our result builds on the work of Reingold, Trevisan, and Vadhan (TCC ’04), who show that when OWF do not exist there is a pseudorandom generator (PRG) construction that makes only one oracle query to the hard-to-invert function. Our proof combines theirs with the Nisan-Wigderson generator (JCSS ’94), and with a recent technique by Berman and Haitner (TCC ’12). Working in the same context (i.e. when OWF do not exist), we also construct a poly-time PRG with arbitrary polynomial stretch that makes non-adaptive queries to an (inefficient) one-bit-stretch oracle PRG. This contrasts with the well-known adaptive stretch-increasing construction due to Goldreich and Micali. Both above constructions simply apply an affine function (parity or its complement) to the query answers. We complement this by showing that if the post-processing is restricted to only taking projections then non-adaptive constructions of PRF, or even linear-stretch PRG, can be ruled out. Both authors were supported by by NSF grant CCF-0845003. UCLA, enmiles@cs.ucla.edu. Research performed while a student at Northeastern University. Northeastern University, viola@ccs.neu.edu" @default.
• W2397748254 created "2016-06-24" @default.
• W2397748254 creator A5025615562 @default.
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• W2397748254 date "2012-01-01" @default.
• W2397748254 modified "2023-09-23" @default.
• W2397748254 title "On the complexity of constructing pseudorandom functions (especially when they don't exist)." @default.
• W2397748254 hasPublicationYear "2012" @default.
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